MICROCIRCULATION AND LYMPHATICS

Question 1

considering the arterial side of blood flow, at what level is resistance regulated?

Answer 1

metarterioles and precapillary sphincter

Question 2

what are the final arterioles called?

Answer 2

metarterioles

Question 3

what kind of flow do capillaries have? produced by?

Answer 3

intermittent flow

vasomotion

Question 4

what is vasomotion? what regulates this, how?

Answer 4

transient opening and closing of precap sphincters and metarterioles

if O2 is OK, then sphincter contracts, it dilates when O2 is low or CO2 is high

Question 5

what is linked to nutrient availability?

Answer 5

local regulation of flow to tissues and individual capillaries

Question 6

what are the four forces on H2O as it moves along the capillary?

Answer 6

capillary hydrostatic pressure
tissue hydrostatic pressure
plasma colloid oncotic pressure
tissue colloid oncotic pressure

Question 7

in terms of these forces, which ones stay constant?

Answer 7

COP, TOP, THP

CHP doesn’t

Question 8

T/F, water is constantly lost from blood into the CSF?

does edema occur?

Answer 8

true

no, because the lymphatics pick it up and return it to the blood via the left internal jugular vein and right subclavian

Question 9

edema occurs if H2O collects in ISF due to:

Answer 9

increase CHP
decrease THP
increase TOP 
decrease COP 
lymphatics blocked
increase capillary permeability